reporting-engine/kpi_dashboard_bokeh/views/webclient_templates.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

    <template id="assets_backend"
              name="Backend Assets (used in backend interface)"
              inherit_id="web.assets_backend">
        <xpath expr="." position="inside">
            <script type="text/javascript" src="/kpi_dashboard_bokeh/static/src/js/bokeh_widget.js"/>
        </xpath>
    </template>
</odoo>